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If you do have the tach then the polarity of the 12v supply must be =
reversed inside the case as well (as mentioned in that article).
It mentions reversing the coil. That isn't necessary and won't make any =
practical difference. Original coils are wired internally to boost the =
HT using the 'auto-transformer' effect as well as connected externally =
to give a certain polarity of spark which jumps the gap easier. If you =
reverse the coil you keep the polarity but lose some of the =
auto-transformer' effect. If you don't you keep the full =
'auto-transformer' effect but reverse the polarity of the spark. Either =
could be significant on veteran low-voltage systems, which would make =
getting the correct polarity coil preferable. But it should make no =
detectable difference to starting or running with HV systems such as =
ours.
PaulH.
----- Original Message -----=20
From: Stan Fickes via Mgs=20
To: i erbs=20
Cc: mglist=20
Sent: Saturday, August 17, 2019 1:19 PM
Subject: Re: [Mgs] Positive earth
My '65 has an electronic tach. Look for the little loop of wire on the =
back. The polarity of the loop must be reversed. I cut and spliced the =
ends of the loop. See=20
=
https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGround.html
On Fri, Aug 16, 2019, 7:54 PM i erbs via Mgs <mgs@autox.team.net> =
wrote:
Other than turning battery around and flashing the voltage =
regulator, are there any concerns with changing my 65 Spridget to =
negative ground?
Is tach mechanical or electric?
Thanks
Working to restart my garage find aftet 25 years.
Ira Erbs
Portland, OR
typos and artifacts are the fault of my phone
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Archive: http://www.team.net/pipermail/mgs =
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<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
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<DIV><FONT size=3D2>If you do have the tach then the polarity of the 12v =
supply=20
must be reversed inside the case as well (as mentioned in that=20
article).</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>It mentions reversing the coil. That isn't =
necessary and=20
won't make any practical difference. Original coils are wired =
internally to boost the HT using the 'auto-transformer' effect as well =
as=20
connected externally to give a certain polarity of spark which jumps the =
gap=20
easier. If you reverse the coil you keep the polarity but lose =
some of the=20
auto-transformer' effect. If you don't you keep the full=20
'auto-transformer' effect but reverse the polarity of the=20
spark. Either could be significant on veteran low-voltage =
systems,=20
which would make getting the correct polarity coil preferable. But =
it=20
should make no detectable difference to starting or running with HV =
systems such=20
as ours.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dmgs@autox.team.net href=3D"mailto:mgs@autox.team.net";>Stan =
Fickes via=20
Mgs</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Deyera3000@gmail.com=20
href=3D"mailto:eyera3000@gmail.com";>i erbs</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=3Dmgs@autox.team.net=20
href=3D"mailto:mgs@autox.team.net";>mglist</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, August 17, 2019 =
1:19=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Mgs] Positive =
earth</DIV>
<DIV><BR></DIV>
<DIV dir=3Dauto>
<DIV dir=3Dauto>My '65 has an electronic tach. Look for the little =
loop of wire=20
on the back. The polarity of the loop must be reversed. I cut and =
spliced the=20
ends of the loop. See </DIV>
<DIV dir=3Dauto><A=20
=
href=3D"https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGroun=
d.html">https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGroun=
d.html</A><BR></DIV>
<DIV dir=3Dauto><BR></DIV><BR>
<DIV class=3Dgmail_quote>
<DIV dir=3Dltr class=3Dgmail_attr>On Fri, Aug 16, 2019, 7:54 PM i erbs =
via Mgs=20
<<A href=3D"mailto:mgs@autox.team.net"; rel=3D"noreferrer =
noreferrer"=20
target=3D_blank>mgs@autox.team.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; =
PADDING-LEFT: 1ex"=20
class=3Dgmail_quote>
<DIV dir=3Dauto>Other than turning battery around and flashing the =
voltage=20
regulator, are there any concerns with changing my 65 Spridget to =
negative=20
ground?
<DIV dir=3Dauto>Is tach mechanical or electric?</DIV>
<DIV dir=3Dauto>Thanks</DIV>
<DIV dir=3Dauto>Working to restart my garage find aftet 25 =
years.<BR><BR>
<DIV dir=3Dauto data-smartmail=3D"gmail_signature">Ira =
Erbs<BR>Portland,=20
OR<BR>typos and artifacts are the fault of my=20
=
phone</DIV></DIV></DIV>_______________________________________________<BR=
><BR><A=20
href=3D"mailto:Mgs@autox.team.net"; rel=3D"noreferrer noreferrer =
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donation $12.75<BR><BR>Archive: <A=20
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